Simplicity 2451; ©1948; Maternity Slip and Panties: The slip, styled with a back opening, is adjusted with tie ends at either side. A faced bra top and softly flared skirt finish the slip. Elastic casing at the back waistline and front buttons which can be regulated to fit, are featured on the panties.
Links to reviews/blog posts
Selvedgeshop on Etsy Size 12
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